My Taurus PT99 has a very large firing pin hole and primers flow back into it with even very light loads that just roll the brass out of the slide. I have gotten into some warm loads and I really can't tell the difference between the light loads and heavier loads just by looking at the primers. It has been my experience that lots of the Taurus 92/99 series guns have large firing pin holes and will allow the primers to flow back.

If I were looking at getting top velocities out of it I would go to small rifle primers, just for the extra cup strength and insurance against a pierced primer. In doing so I would also start very low and work up since the reloading data does not include rifle primers.

A 124 at 1100 isn't exactly light, but seems to be a reasonable load speedwise. Any particular reason you are loading them so short? I would expect pressures in your loads to be as high as standard factory loads or a little higher with that OAL.

Thanks for all the good information. I was at the range yesterday and shot two different factory loads and three hand loads. Guess what, its the Taurus. Big champhered firing pin hole. I had not really looked closlely at factory shot through it.

Used to load 122gr RNFP's at about the same velocity and a hair shorter--- 1.040" over 4grs Bullseye. Always shot fine in my Rugers, but gave the same type of "Primer Flow ?" in all of my friends guns that happened to be Taurus.

It may very well be the larger firing pin hole...

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